FLIR
DM92
USER
GUIDE
Document
Identifier:
DM92
‐
en
‐
US_AB
18
5.11.5
Frequency
mode
(ACV
and
ACA
only)
In
Frequency
mode,
the
frequency
is
displayed
in
the
main
display
and
the
period
is
displayed
in
the
secondary
display.
Frequency
mode
is
available
when
measuring
AC
voltage
or
current.
1.
Select
and
enable
Frequency
mode
as
described
in
section
5.11.1
Selecting
the
mode
.
5.11.6
Relative
mode
In Relative mode, the difference between the current reading and a stored reference value is
displayed in the main display. The reference value is displayed in the secondary display.
1.
Select
and
enable
Relative
mode
as
described
in
section
5.11.1
Selecting
the
mode
.
5.11.7
dBm
Mode
(ACV
only)
The
decibel
(dB)
is
a
logarithmic
unit
that
expresses
the
magnitude
of
a
physical
quantity
relative
to
a
specified
or
implied
reference
level.
In
dBm
mode,
the
meter
displays
AC
voltage
measurements
in
dB
or
dBm
on
the
secondary
display.
dB
and
dBm
are
defined
as
follows:
dB
=
20
log
(V
AC
/1).
dBm
=
20
log
(V
AC
/0.7746).
1.
Select
and
enable
dBm
mode
as
described
in
section
5.11.1,
Selecting
the
mode
.
2.
Press
the
the
or
button
to
toggle
between
the
display
of
dB
and
dBm.
5.11.8
Manual
Data
Recording
Mode
The
meter
has
99
memory
locations
for
the
storage
of
measurement
data.
1.
Select
and
enable
Manual
Data
Recording
mode
as
described
in
section
5.11.1
Selecting
the
mode
.
2.
Press
the
or
button
to
cycle
through
the
mode
options:
SAVE,
LOAD,
and
CLEAR
shown
on
the
secondary
display.
3.
Press
the
button
to
activate
the
displayed
option:
SAVE
:
The
data
on
the
main
display
is
saved
to
a
memory
location
shown
by
the
indicator
in
the
upper
part
of
the
display.
LOAD
:
The
data
stored
in
the
memory
location
shown
by
the
indicator
is
displayed.
Use
the
or
button
to
change
the
memory
location.
Press
the
button
to
exit
the
load
function.
CLEAR
:
The
data
in
all
memory
locations
is
erased.
